FMC PMDG747 - "WHAT??!" I don't get it!!

Hey guys,
for all of you, who are familiar with the FMC of the PMDG, please help me! It HAS to be possible, to switch a ILS-frequency without programming all this enroute-stuff. I'd do it, but since I know that up-to-date NAVDATA costs money and I don't want to spend more money for an already payed aircraft, I'd like to have it just taking my frequency without saying "INVALID ENTRY"! I could kill this thing!!!
Why can't NAVRAD just take my entry like "111.10/231"?? Why can he take VORs and not ILS? How can I get the ILS to work? PLEASEE!!!

Thanks,
Conan :-[
EDIT: I'm flying online on IVAO. That's why I need something, which works fast, in case the controller advises me to do anything different to my flightplan! And programming a goddamn bullish FMC is NOT FAST!!
for all of you, who are familiar with the FMC of the PMDG, please help me! It HAS to be possible, to switch a ILS-frequency without programming all this enroute-stuff. I'd do it, but since I know that up-to-date NAVDATA costs money and I don't want to spend more money for an already payed aircraft, I'd like to have it just taking my frequency without saying "INVALID ENTRY"! I could kill this thing!!!
Why can't NAVRAD just take my entry like "111.10/231"?? Why can he take VORs and not ILS? How can I get the ILS to work? PLEASEE!!!


Thanks,
Conan :-[
EDIT: I'm flying online on IVAO. That's why I need something, which works fast, in case the controller advises me to do anything different to my flightplan! And programming a goddamn bullish FMC is NOT FAST!!